2. Tools required

I have tried to reduce the number of external tools, but when looking back
it seems I were not very successful. At least I managed to get everything
working with the native CMD.EXE shell only. However, there is still plenty
of software required.
Most of this software is available from hobbes.nmsu.edu or ftp.leo.org
via anonymous FTP. The following shopping list shows what you will need:

gcc EMX/gcc emx 0.9C patch4 or later (0.9d preferred!)

gzip GNU zip/unzip

tar GNU tar

patch Larry Wall's patch utility (attention: incompatible tool with same name in OS/2)

install BSD/GNU install

rm,mv,cp GNU file utilities

tee,.. GNU shell utilities

groff GNU nroff/troff

sed GNU sed stream editor

grep GNU grep

gawk GNU awk

make GNU make 3.71/3.72 (use the one from Xprog.zip!)

flex GNU flex

bison GNU bison

m4 GNU m4

find GNU find (attention: incompatible tool with the same name in OS/2)

If there is no version number given, any new version will do. Particularly
critical is only EMX/gcc and GNU make. Note that the second GCC implementation
which might still be available from some archives is NOT compatible.

Furthermore, you need the X11R6.8.2 sources. These are available from
the common X.org repositories. Look into a directory which is
often named /pub/R6.8.2.